GB/T 41967-2022_English: PDF (GB/T41967-2022)
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Anisotropic neodymium iron boron permanent magnetic powder
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| Standard ID | GB/T 41967-2022 (GB/T41967-2022) | | Description (Translated English) | Anisotropic neodymium iron boron permanent magnetic powder | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H65 | | Classification of International Standard | 77.150.99 | | Word Count Estimation | 14,129 | | Date of Issue | 2022-12-30 | | Date of Implementation | 2023-07-01 |
GB/T 41967-2022
ICS 77.150.99
CCSH65
National Standards of People's Republic of China
Anisotropic NdFeB Permanent Magnetic Powder
Posted on 2022-12-30
2023-07-01 implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Rare Earth Standardization Technical Committee (SAC/TC229).
This document was drafted by. Youyan Rare Earth New Materials Co., Ltd., Beijing Zhongke Sanhuan High-Tech Co., Ltd., Anhui Earth Bear New Materials
Materials Co., Ltd., Nonferrous Metal Technology and Economic Research Institute Co., Ltd., Youyan Rare Earth High-Tech Co., Ltd., Baotou Rare Earth Research Institute,
Qiandong Rare Earth Group Co., Ltd., Fujian Changting Jinlong Rare Earth Co., Ltd., and Baotou Rare Earth New Material Technology Research and Development Center.
The main drafters of this document. Luo Yang, Yan Wenlong, Wang Zilong, Yang Yuanfei, Yu Dunbo, Cao Shuhao, Huang Xiulian, Song Guanyu, Zhang Jiulei, Yao Nanhong,
Fu Jianlong, Jin Zhenjun, Wang Zhongkai, Shan Weikang, Quan Ningtao, Hu Quanxia, Shen Lihan, Jin Guoshun, Mou Di.
Anisotropic NdFeB Permanent Magnetic Powder
1 Scope
This document stipulates the classification and brand name, technical requirements, test methods, inspection rules, packaging, marking, transportation of anisotropic NdFeB permanent magnet powder.
Transmission, storage and accompanying documents.
This document is applicable to anisotropic magnets produced by the hydrogen absorption-disproportionation-dehydrogenation-recombination (HDDR) process or the hot-pressing and heat-deformation magnet crushing process.
Permanent NdFeB magnet powder.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
GB/T 1479.1 Determination of bulk density of metal powders - Part 1.Funnel method
GB/T 1480 Determination of particle size by dry sieving of metal powder
GB/T 3217 Magnetic test methods for permanent magnet (hard magnetic) materials
GB/T 3850 Density Determination Method for Dense Sintered Metal Materials and Cemented Carbide
GB/T 8170 Numerical rounding off rules and expression and determination of limit values
GB/T 9637 Electrotechnical Terminology Magnetic Materials and Components
GB/T 15676 Terminology of rare earth
GB/T 24270 Measurement method for temperature coefficient of magnetic properties of permanent magnet materials
GB 39176 Packaging, marking, transportation and storage of rare earth products
GB/T 40794 Detection method for irreversible loss of high temperature magnetic flux of rare earth permanent magnet materials
3 Terms and Definitions
The following terms and definitions defined in GB/T 9637 and GB/T 15676 apply to this document.
3.1
After being magnetized in a certain direction, the magnetic performance of the magnetization direction is much higher than that of NdFeB permanent magnet powder with magnetic properties in other directions.
Note. See Appendix A for the preparation process and chemical composition ratio of anisotropic NdFeB permanent magnet powder.
3.2
HDDR
The NdFeB alloy explodes into hydrogen powder after absorbing hydrogen. At a certain temperature, the main phase Nd2Fe14B disproportionates and decomposes, followed by forced dehydrogenation.
The process of preparing anisotropic NdFeB permanent magnet powder by recombining the chemical product into a fine-grained Nd2Fe14B phase.
3.3
The quick-quenched NdFeB magnetic powder is first made into anisotropic NdFeB magnets through hot pressing and thermal deformation processes, and then the prepared anisotropic NdFeB magnets
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